tsconfig.json

{
  "compilerOptions": {
    "target": "ES2017",
    "module": "commonjs",
    "lib": ["es2017"],
    "allowJs": true,
    "checkJs": true,
    "noEmit": true,
    "strict": true,
    "alwaysStrict": true,
    "types": ["node"],
    "esModuleInterop": true
  },
  "include": ["lib/**/*.js"]
}